Magnetic clamp



Aug. 19, 1952 B, FUNK 2,607,367

MAGNETIC CLAMP Filed April 4, 1950 INVENTOR. .BERN/1 QD F UNK Blf-52- All* Arron/mcs Patented Aug. 19, 1952 MAGNETIC CLAMP Bernard Funk, New York, N. Y., assigner to Annex Manufacturing Co., Ine., New York, N. Y., a corporation of New York Application April 4, 1950, Serial No. 153,920

This invention relates to a device for holding the tip of a hat lining while being attached to the side piece.

As presently practised, the tip of a hat lining is held between two horizontal clamps of elliptical form by pinsI while being sewed to the side piece. One of the pins extends upwardly from the bottom clamp through an opening in the top clamp while four other pins extend downwardly from the top clamp for releasable insertion in aligned corksfembedded in the surface of the bottom clamp. The clamps are rotatably mounted and by adjustment give either an eccentric motion for the elliptical hat lining tip or concentric motion for the circular hat lining tip.

It is an object of the instant invention to provide a device for holding the tip of a hat lining in which the number of holding pins are materially reduced compared with known devices or even eliminated.

A further object is the creation of a device for holding a hat lining tip in which there is less hazard for the operator than when working with known devices.

It is also'an object of the instant invention to provide'a device of rugged construction wherein the problem of maintenance has been reduced to a minimum.

Other objects of the instant invention will become apparent in the course of the following specication.

In the accomplishment of these objectives, the tip of the hat lining is held between two elliptical clamping plates by electro-magnetic force, the edges of the tip protruding beyond the peripheries of the superposed plates. The plates are rotatably mounted in a horizontal plane and are designed for either a concentric motion or an adjustable eccentric motion so that while the edge of the tip is being sewed to the edge of the side piece, the periphery of the tip whether circular or elliptical will always be in the proper position at the point of attachment of the side piece.

The invention will appear more clearly when taken in conjunction with the accompanying drawing showing by way of example a preferred embodiment of the inventive idea.

ln the drawings:

Figure 1 is a top plan view of the electro-magnetic device for holding the tip of a hat lining while being attached to the side piece and constructed in accordance with the principles of this invention;

Figure 2 is a sectional view along 2--2 of Figure l: and

2 Claims. (Cl. 112-14) Figure 3 is a sectional view along 3-3 of Figure 2.

Referring now in greater detail to the drawings where like reference numerals indicate like parts, reference numeral I0 indicates the clamp assembly, II the electro-magnet assembly, l2 the carriage assembly, I3 the brush assembly, and I4 the base block.

The clamp assembly I0 is constituted of` the upper clamping plate I5 and the lower clamping plate I6. Each clamping plate is of elliptical form with identical major and minor axes and are made of magnetic material. Extended upwardly from the upper clamping plate I5 is a. handle mem-ber I'I attached to the top surface of the upper clamping plate I5 by any 'known means, the means illustrated being the similar screws I8 and I9, the heads of which are vcountersunk in the bottom surface of the upper plate I5 with the opposite ends threaded into aligned taps in the ends of the handle member. The upper clamping plate I5 may be provided with an opening 20 at the center through which a pin may protrude, the opposite end of the pin being attached in any known manner to the core 2 I, later described. In the center of the lower clamping plate I6 is a circular opening which design permits fitting the plate over the top of the core 2 I.

The core 2I is of cylindrical shape and preferably made from magnetic material. Of course, the core may be a solid member or made of laminations but provided with a circular recess in the top, the recess being extended downwardly to leave a central circular member 22 around which are wound the insulated electrical conductors 23. Obviously, the conductors can be first formed into a coil with a central opening suitable for insertion over the central member 22. After the coil is inserted, a coil cap 66, also of magnetic material, is tted into the top of the circular opening, the plane of the top surface of the coil cap being in the plane of the top surface of the lower clamping plate I6. Below the top of the core 2| is an integrally formed flange 24 in a horizontal plane, that portion of the core above the flange fitting into the previously mentioned circular opening in the lower clamping plate I6 the flange being so positioned relative to the top of the core that the top of the plate I6 and the top of the core 2I will be ilush when assembled. Vertical openings through the flange 24 registering with similar openings in the lower plate I6 provide a means for attaching the plate I6 to the core 2| by any suitable fasteners 25 so inserted or designed as not to protrude above the lower plate IS nor below the flange 24 where the following described slip ring sleeve 26 is positioned.

The slip ring sleeve 26 is formed of electrically non-conductive material fitted around the outside surface of the core 2| between the previously mentioned flange 24 and the later descri-bed base plate 21. The slip ring sleeve 26 is separated into an upper channel 28 and a lower channel 28 by an electrically non-conductive spacer 30. Of course, the spacer 36 may be integrally formed with the sleeve 26 if desired. In the upper channel 28 is a band 3| of electrically conductive ma,- terial and in the lower channel 29 a similar band 32. The band 3| is electrically connected toone end of the windings of the electrical conductors 23 f through a passageway 33 formed in the core 2|A while band 32 is similarly connected' tothe oppo- Y site end of the windings 23 through a like passageway 34. Y

Concentric or adjustable eccentric motion is provided for the core 2|- and in turn for the .previously mentioned clamping plates in the followingmanner: The core 2l is attached inany known manner to the base plate 21 :(Figs. `2 and 3) in the bottom surface of which` are two longitudinal slideways 35 and 36` (Fig. 3) and intermediate said slideways a .transverse slideway 31. At each end of the base plate21are-.the downwardly directed end members 36A and 39 attached to theedge of the plate 21 by the similar screws 4I). ,The base plate 21 is rotatably supported by the carriage assembly I2 which in turn is constituted of a center circular pivot plate 4I in ywhich is formed a radial slot 42 and around At the free end of the adjustment bar 44 is the brush assembly I3 constituted of the brush stud 66 vertically attached to the bar 44 and on the upper end of which is an electrical insulator 6I secured thereto in any known manner. To the insulator 6I are fastened the brushes 62 and 63 for one side of an electrical potential and below the brushes 62 and 63, similar brushes, one of which is shown in Figure 2 for the opposite side of the electrical potential. The brushes extend outwardly from the insulator and thence forwardly for slidable contact under inwardly directedl tension, with the above mentioned band 3| in thecaseof the brushes 62 and 63 and with the A`band 32 in the case of the other two brushes.

Any known means'may be used for connecting the brushes to the-source of electrical supply.

Between the top of the brush stud 60 and the lower clamping plate I6 is a detent spring 64 one the periphery of which at the bottom is an outthe plate 4| is a support46 provided .withv the f bearings 41. `On the top surface of thev support 46 at each end are the opposed bearings .48 and 49 which coact with the previously mentioned longitudinal slideways 35 and 36, respectively, inv the upper base plate V21. VThrough the radial slot 4.2 of the circular pivot plate 4I is inserted the bearing post 50 threaded; at one end for attachment to the bar 44Y and extended at the opposite end above the plane of the carriage assembly I2 for the attachment cfa Ybearing 5| which' coacts with the transverse slideway 31 in the upper base plate 21 to give the desired concentric and adjustable eccentric motion to the core 2 I as later shown. On the sides of the support 46 are the similar bearings 52 which are supported againsty the bottom surface of the upper plate 21 by the side members 53 and 54 of inwardly turned L-shape form which are fastened to the sides of the plate 21 by the screws 46.

The previously mentioned bearing4 post 50 threaded into the adjustment bar 44 is adjustable in the circular pivot plate 4I by Virtue ofthe radial slot 42 in which it is releasably fastened by any known means so that the device will give circular motion when at the center of the pivot plate and elliptical motion of varying major axis as moved outwardly therefrom. The adjustment bar 44 is in turn adjustable by being slid'ably mounted in the sleeves 55 and 56 (Fig. 1) of the base block I4 in which is formed a longitudinal slot 51 and through which the bearing post 58 is inserted into the bar 44. The base block I4 then turns downwardly and outwardly as shown in Figure 2 for attachment to any suitable foundation (not shown) by any suitable fastener (not shown) through a slot 59.

end of which is attached to the stud 66 in a known manner while the opposite end is extended forwardly under the bottom surface of theV lower clamping plate I6 on which a protuberance 65v is: formed or attached for coaction with the spring 64 in one position of the lower clamping plate I6x4 as shown in Figure 2. K

In operation: f

With the upper clamping plate I5 removedI from the lower clamping plate I6, the tip of theA hat lining is placed over the lower plate I5 with the center pin if used through the lining and thel periphery of the tip protruding beyond the edge' of the lower plate. The upper plate I5 is then` superposed over the lining tip and lower plate and the brushes connected to a source of electrical energy corresponding to the electrical rating of the core which will hold the tip under sufficient pressure between the clamp plates for the sewing operation. At the point of attachment of the edge of the tip of the lining to the side member, the sewing machine will draw the edge of the tip and the clamp assembly toward the needle so that the edge of the tip will be in proper position for sewing at the point of attachment. When the.. sewing operation is completed,` pullingA upwardly on the handle member I1 will release the tip and attached side member. As shown in Figure 2, the bearing post 5I) is at the center of the pivot plate 4| in which position the device is suitable for the attachment of a circular lining, tip to the side member. However, by moving the bearing post 50 outwardly in the radial slot 42 eccentric motion will be imparted to the clamp assembly Ill for the attachment of an elliptical lining tip, the magnitude of the movement of the post 50 beingdependent upon the size of the elliptical tip.

It will be understood that the invention is not limited to the exact disclosure herein describedbut may lend itself to a variety of expressions within the scope of the appended claims.

What is claimed is:

l. A device adapted to hold the tip of a hat lining while being attached to the side member incombination with an electro-magnet, the magnet having a core and windings about the core; the device comprising an electro-magneticclamp for the tip, theI electro-magnetic'clamp` comprising a lower clamping member and an upper clamping member coacting with the lower member; the lower clamping member comprising a plate. the plate having an opening formed therethrough substantially at the center, meansA for' securing the electro-magnetic coil in the opening with one end of the core substantially ush with the top surface of the plate and with the windings' extended downwardly below the plate, a slip ring sleeve circumferentially formed around the windings, the sleeve being divided into two electrically insulated channels, means for connecting the opposite ends of the windings to opposite channels, a brush in electrical engagement with each channel, means for connecting the brushes to a source of electrical energy, and a pin disposed upright on the end of the core substantially flush with the plate; the upper clamping member comprising a plate of magnetic material coacting with the lower clamping member, the plate of magnetic material having an opening formed therein coacting with the upwardly directed pin in end of the core of the coil in the lower clamping member, and means for imparting concentric and eccentric motion to the clamping members.

2. In a device adapted to guide the periphery of the tip of a hat lining while being attached to the side member, the device having an upper and a lower clamping plate for the tip; the improvements comprising a base plate disposed on the bottom of the lower clamping member, the base plate having a longitudinal slideway at each end and a transverse slideway intermediate the longitudinal slideways, a carriage for the base plate, the carriage comprising a circular pivot plate, the pivot plate having a radial slideway formed therein, an adjustable base block for maintaining the pivot plate in a horizontal plane, means for securing the pivot plate to the base block, a bearing post disposed through the radial slideway of the pivot plate, one end of the post coacting with the transverse slideway in the base plate, and means for securing the opposite end of the post in the base block; the carriage further comprising a support rotatably mounted around the pivot plate, an upwardly directed bearing coacting with the longitudinal slideways in the base plate disposed on the support at each end, and means for maintaining the carriage longitudinally slidable on the base plate, said means comprising at least two bearings disposed on each side of the supDOrt, the rotary members of the bearings protruding above the plane of the top surface and below the plane of the bottom surface of the support, a side member of L-shape disposed on each side of the base plate, the bottoms of the L-shaped side members being turned inwardly and coacting with the rotary members of the bearings on the sides of the support, and means for closing the ends of the base plate intermediate the L-shaped members.

BERNARD FUNK.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 42,158 Blackham Apr. 5, 1864 75,637 Lockwood Mar. 17, 1868 531,098 Chambury Dec. 18, 1894 

